CN-117513192-B - Demolition method for old approach bridge

CN117513192BCN 117513192 BCN117513192 BCN 117513192BCN-117513192-B

Abstract

The invention discloses a demolition method of an old approach bridge, which comprises the following construction steps of S1 demolishing a cast-in-situ wearing layer, a cast-in-situ surface layer and an accessory structure on a bridge deck of an upper section, S2 demolishing a plurality of hollow slab beams of the same span of the upper section by using a pick machine, S3 demolishing cap beams of the front end by using the pick machine, S4 repeating the steps of S2-S3, demolishing the rest hollow slab beams and cap beams of the upper section in sequence, S5 demolishing pile foundations of the upper section by using the pick machine, S6 splicing and building a bridge girder erection machine by crossing new and old approach bridges at the beginning of the approach bridge of the upper section, S7 demolishing the hollow slab beams of the upper section one by using the bridge girder erection machine from the bank side to the river side, S8 demolishing the bridge erection machine after withdrawing the cap beams of the upper section. The invention mainly adopts the pick machine and the bridge girder erection machine for dismantling, is superior to the floating crane ship and the crane in the aspects of safety, construction period, process operability, economy and environmental protection, and can perfectly solve the problem of dismantling the bridge under the limited condition.

Inventors

Shen Weidan
GE FENG
HAN ZHENFEI
CHEN CUILIANG
YIN YONG
ZHANG YIBO
LI RUNXIAN
HE JUN

Assignees

中交第三航务工程局有限公司
中交三航局第二工程有限公司

Dates

Publication Date: 20260512
Application Date: 20231122

Claims (7)

1. The demolition method of the old approach bridge is characterized by comprising land section demolition and water section demolition, and comprises the following construction steps: S1, removing a cast-in-situ wearing layer, a cast-in-situ surface layer and an accessory structure on the land bridge deck according to the land bridge deck and the accessory engineering conditions; S2, sequentially dismantling a plurality of hollow slab beams of the same span of the land section by using a pick machine according to the sequence from the upstream side to the downstream side, and specifically comprising the following steps: S201, using two pick machines to chisel at the 1/6-1/3 of the near end part of the land section hollow slab beam at the upstream side, and naturally landing the beam body broken into three sections; s202, crushing a landed beam body section into a plurality of small blocks by using a pick machine; s203, delivering the beam body crushed into blocks to a rear excavator and a pick machine for further crushing, and sorting and transporting; S204, repeating the step S201-the step S203 to chisel out the rest multi-truss hollow plate beams in the span; s3, after the hollow slab beam of the land section of the first span is dismantled, using a pick machine to dismantle the cap beam at the front end of the hollow slab beam, and specifically comprising the following steps: S301, using two pick machines on the same side to respectively chisel at the position 1/6-1/3 of the proximal end part of the cap beam, and naturally landing a beam body broken into three sections; S302, crushing a landed beam body section into a plurality of small blocks by using a pick machine; S303, delivering the beam body crushed into blocks to a rear excavator and a pick machine for further crushing, and sorting and transporting; S4, repeating the steps S2-S3 according to the sequence from the shore side to the river side, and sequentially removing the rest hollow plate beams and cap beams of the land section; s5, crushing and dismantling the land section pile foundation by adopting a pick machine; S6, crossing the new bridge approach and the old bridge approach at the beginning of the bridge approach at the water upper section to assemble and build a bridge girder erection machine, and positioning the bridge girder erection machine and a girder transporting vehicle; S7, removing the water upper section hollow plate girder from the bank side to the river side by root and span by adopting a bridge girder erection machine, and specifically comprising the following steps: S701, cutting and separating the hollow plate girder along the plate seam by adopting a cutting machine from the surface layer downwards; S702, lifting a truss hollow slab beam to a certain height by adopting a bridge girder erection machine and a lifting auxiliary device; s703, transversely moving the lifted hollow slab beam to the position above the beam transporting vehicle at the new bridge approach side; s704, lowering the hollow slab beam above the beam transporting vehicle onto the beam transporting vehicle, fixing and transporting; s705, repeating the steps S702-S704 from one side to the other side, and sequentially dismantling the rest hollow plate beams in the span; s706, longitudinally moving the bridge girder erection machine across the span, and repeating the steps S702-S705 according to the dismantling sequence reverse to the previous span to dismantle a plurality of hollow slab girders in the span in sequence; S707, repeating the step S706 from the side to the river side in an S-shaped sequence, and removing the rest hollow plate beams of the upper water section one by one; S8, removing the bridge girder erection machine after the bridge girder erection machine exits along the water upper section hat girder.
2. The method of removing an old approach bridge according to claim 1, wherein in step S201, two pick machines are respectively used for cutting at 1/3 of two ends of the hollow slab beam.
3. The method for removing an old approach bridge according to claim 1, wherein the step S5 comprises the following steps: s501, crushing and removing a plurality of groups of corresponding pile foundations root by root from the same side by using a plurality of pickaxes; s502, delivering the pile foundations crushed into blocks to a rear excavator and a pick machine for further crushing, and sorting and transporting; S503, repeating the steps S501-S502 according to the sequence from the shore side to the river side, and sequentially dismantling the rest pile foundations of the land section.
4. The method of removing an old approach bridge according to claim 3, wherein in step S501, the plurality of pick machines remove pile foundations root by root in the order from the upstream side to the downstream side.
5. The method for removing an old approach bridge according to claim 1, wherein in the step S6, a sand barrel or a steel barrel is used as a supporting pad barrel to support and pad the front supporting leg and the track of the bridge girder erection machine.
6. The method of claim 5, wherein in step S6, the transverse rail of the bridge girder erection machine is welded by I-steel rails, and the transverse rail extends into the newly built dock face layer.
7. The method of claim 1, wherein in step S701, the surface layer is cut mainly by a wheel saw cutter, and the difficult area is cut by a rope saw cutter.

Description

Demolition method for old approach bridge Technical Field The invention relates to the technical field of bridge approach dismantling, in particular to a method for dismantling an old bridge approach. Background Dock access refers to a passage where a dock is connected to land by bridging when the water level fluctuates greatly or the gradient of the river bed is too steep to be suitable for setting an access. Along with the increasing of wharfs in China, traffic is increased continuously, overload limit vehicles are increased continuously, a certain influence is brought to the approach bridge, and the approach bridge needs to be dismantled for meeting the modern transportation demands or reaching the design years, and the normal passing of the general approach bridge dismantling engineering is guaranteed, so that the construction period is short, the task is heavy, the bridge dismantling difficulty is high, and the construction safety requirement is high. The existing approach bridge is usually dismantled by using a floating crane or a crane, wherein when the floating crane is used for dismantling, the influence of water depth is considered when the floating crane is used for construction on the near shore side, the influence of draft is considered when the floating crane is used for construction on the near shore side, the elevation of a mud surface is required to be measured in advance when the floating crane is used for construction on the near shore side water area, meanwhile, the tide-waiting construction window period is required to be determined by combining tides, the daily construction time is not fixed, part of the working time can be positioned at night and can be influenced by adverse natural factors such as tide, typhoon and chill, the construction efficiency is low, the construction time is influenced by the bumping of wind waves, the related safety risks are easily caused to existing structures, operators, equipment and the like, moreover, the floating crane is a large-sized ship, heavy oil and diesel oil have high energy consumption, serious air pollution and high noise, and domestic garbage generated by the ship is more, and special ship recovery treatment is required; When the crane is used for dismantling operation, the old approach bridge surface layer is limited by load carrying capacity, and a large-tonnage crane cannot be used, so that only medium-sized and lower crane equipment can be used, the crane lifting capacity generally attenuates along with the increase of lifting distance, lifting height and the like, structural parts such as a shoulder pole and the like are required to be additionally arranged, the load requirement on the support leg is high during lifting, measures such as support pad reinforcement and the like are required to be carried out, the crane equipment is complex to operate, frequent displacement is required, the construction efficiency is low, the stability of the equipment is generally high, the safety risk of frequent displacement is high, the support pads, reinforcement and the like are required to be adopted for each support leg during construction, and if the crane diesel oil and hydraulic oil are used as equipment for dismantling an approach bridge span, the safety is general, and the crane diesel oil and hydraulic oil also can generate larger air pollution and noise. Disclosure of Invention In view of the above, the invention provides a method for dismantling an old approach bridge, which has the advantages of high safety in dismantling process, simple and convenient dismantling construction, high dismantling efficiency, economy and environmental protection. The invention solves the problems by the following technical means: The invention relates to a demolition method of an old approach bridge, which comprises land section demolition and water section demolition, and comprises the following construction steps: S1, removing a cast-in-situ wearing layer, a cast-in-situ surface layer and an accessory structure on the land bridge deck by adopting small equipment such as an air pick, a handheld cutter, an air compressor, a roughening machine and the like according to the land bridge deck and the accessory engineering conditions; S2, sequentially dismantling a plurality of hollow slab beams of the same span of the land section by using a pick machine according to the sequence from the upstream side to the downstream side, and specifically comprising the following steps: S201, using two pick machines to chisel at the 1/6-1/3 of the near end part of the land section hollow slab beam at the upstream side, and naturally landing the beam body broken into three sections; s202, crushing a landed beam body section into a plurality of small blocks by using a pick machine; s203, delivering the beam body crushed into blocks to a rear excavator and a pick machine for further crushing, and sorting and transporting; S204, repeating the step S201-the step S203 to chisel out